To reach this conclusion, one has to do a dihybrid cross. This means that two genes responsible for different traits need to be analyzed at the same time.

1) Starting with a parental generation of a cross between two pure lines (homozygous for both genes) with different traits, a plant with yellow and round seeds (YYRR) and another with green and wrinkled seeds (yyrr). The F1 will be phenotypically homogeneous (yellow and round), and genotypically heterozygous (YyRr).

2) If the individuals from the F1 are crossed with one another, we have to do a Punnett Square to determine the phenotypic ratio of the F2.

If the genes assort independently, the F1 individuals will produce their different gametes with the same probability. Each possible gamete will appear in a 1/4 proportion: YR, Yr, yR, yr.
The 9:3:3:1 ratio is a result of analyzing the possible phenotypes that result from the dihybrid cross.

See the attached image for an illustration of the crosses in each generation and the Punnett Square.

4 0

3 years ago

"The goal during digestion is to break carbohydrates, proteins, and lipids down into smaller units, including ____."

Viktor [21]

Glucose, amino acids, lipids and glycerol.

Explanation:

Carbohydrate is broken into glucose molecules

protein is broken into amino acids

Lipid is broken into fatty acids and glycerol.

Starch present in the food is broken to glucose molecules to yield energy.

Protein is digested in stomach by the action of pepsin, trypsin and chymotrypsin.

Glycosidic bonds of starch is broken down by salivary and pancreatic amylase enzyme.

fat is acted upon by lipase enzymes from pancreatic and intestinal juices.

these are broken into smaller units so that gets absorbed by blood and carries throughout the body.

4 0

3 years ago

Greenhouse gases are essential to support life on earth. True or false?

just olya [345]

Greenhouse gases are naturally occurring gases that are also produced as a result of human consumption, such as the burning of fossil fuels. They are essential to life in that a gas such as carbon dioxide (Co2) is essential to photosynthesis and the production of oxygen which helps to sustain life. However, the levels of greenhouse gases are far outreaching their natural limits and are having a negative impact on human and animal life.

6 0

3 years ago

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